src/lib/ffmpeg_encoder.cc

   1 /*
   2     Copyright (C) 2017-2018 Carl Hetherington <cth@carlh.net>
   3
   4     This file is part of DCP-o-matic.
   5
   6     DCP-o-matic is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     DCP-o-matic is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 */
  20
  21 #include "ffmpeg_encoder.h"
  22 #include "film.h"
  23 #include "job.h"
  24 #include "player.h"
  25 #include "player_video.h"
  26 #include "log.h"
  27 #include "image.h"
  28 #include "cross.h"
  29 #include "butler.h"
  30 #include "compose.hpp"
  31 #include <iostream>
  32
  33 #include "i18n.h"
  34
  35 using std::string;
  36 using std::runtime_error;
  37 using std::cout;
  38 using std::pair;
  39 using std::list;
  40 using boost::shared_ptr;
  41 using boost::bind;
  42 using boost::weak_ptr;
  43
  44 FFmpegEncoder::FFmpegEncoder (
  45         shared_ptr<const Film> film,
  46         weak_ptr<Job> job,
  47         boost::filesystem::path output,
  48         ExportFormat format,
  49         bool mixdown_to_stereo,
  50         bool split_reels,
  51         int x264_crf
  52         )
  53         : Encoder (film, job)
  54         , _history (1000)
  55 {
  56         int const files = split_reels ? film->reels().size() : 1;
  57         for (int i = 0; i < files; ++i) {
  58
  59                 boost::filesystem::path filename = output;
  60                 if (files > 1) {
  61                         string extension = boost::filesystem::extension (filename);
  62                         filename = boost::filesystem::change_extension (filename, "");
  63                         /// TRANSLATORS: _reel%1.%2 here is to be added to an export filename to indicate
  64                         /// which reel it is.  Preserve the %1 and %2; %1 will be replaced with the reel number
  65                         /// and %2 with the file extension.
  66                         filename = filename.string() + String::compose(_("_reel%1%2"), i + 1, extension);
  67                 }
  68
  69                 _file_encoders.push_back (
  70                         shared_ptr<FFmpegFileEncoder>(
  71                                 new FFmpegFileEncoder(
  72                                         _film->frame_size(),
  73                                         _film->video_frame_rate(),
  74                                         _film->audio_frame_rate(),
  75                                         mixdown_to_stereo ? 2 : film->audio_channels(),
  76                                         _film->log(),
  77                                         format,
  78                                         x264_crf,
  79                                         filename
  80                                         )
  81                                 )
  82                         );
  83         }
  84
  85         _player->set_always_burn_open_subtitles ();
  86         _player->set_play_referenced ();
  87
  88         int const ch = film->audio_channels ();
  89
  90         AudioMapping map;
  91         if (mixdown_to_stereo) {
  92                 _output_audio_channels = 2;
  93                 map = AudioMapping (ch, 2);
  94                 float const overall_gain = 2 / (4 + sqrt(2));
  95                 float const minus_3dB = 1 / sqrt(2);
  96                 map.set (dcp::LEFT,   0, overall_gain);
  97                 map.set (dcp::RIGHT,  1, overall_gain);
  98                 map.set (dcp::CENTRE, 0, overall_gain * minus_3dB);
  99                 map.set (dcp::CENTRE, 1, overall_gain * minus_3dB);
 100                 map.set (dcp::LS,     0, overall_gain);
 101                 map.set (dcp::RS,     1, overall_gain);
 102         } else {
 103                 _output_audio_channels = ch;
 104                 map = AudioMapping (ch, ch);
 105                 for (int i = 0; i < ch; ++i) {
 106                         map.set (i, i, 1);
 107                 }
 108         }
 109
 110         _butler.reset (new Butler (_player, film->log(), map, _output_audio_channels));
 111 }
 112
 113 void
 114 FFmpegEncoder::go ()
 115 {
 116         {
 117                 shared_ptr<Job> job = _job.lock ();
 118                 DCPOMATIC_ASSERT (job);
 119                 job->sub (_("Encoding"));
 120         }
 121
 122         list<DCPTimePeriod> reel_periods = _film->reels ();
 123         list<DCPTimePeriod>::const_iterator reel = reel_periods.begin ();
 124         list<shared_ptr<FFmpegFileEncoder> >::iterator encoder = _file_encoders.begin ();
 125
 126         DCPTime const video_frame = DCPTime::from_frames (1, _film->video_frame_rate ());
 127         int const audio_frames = video_frame.frames_round(_film->audio_frame_rate());
 128         float* interleaved = new float[_output_audio_channels * audio_frames];
 129         shared_ptr<AudioBuffers> deinterleaved (new AudioBuffers (_output_audio_channels, audio_frames));
 130         for (DCPTime i; i < _film->length(); i += video_frame) {
 131
 132                 if (!reel->contains(i)) {
 133                         ++reel;
 134                         ++encoder;
 135                         DCPOMATIC_ASSERT (reel != reel_periods.end());
 136                         DCPOMATIC_ASSERT (encoder != _file_encoders.end());
 137                 }
 138
 139                 pair<shared_ptr<PlayerVideo>, DCPTime> v = _butler->get_video ();
 140                 (*encoder)->video (v.first, v.second);
 141
 142                 _history.event ();
 143
 144                 {
 145                         boost::mutex::scoped_lock lm (_mutex);
 146                         _last_time = i;
 147                 }
 148
 149                 shared_ptr<Job> job = _job.lock ();
 150                 if (job) {
 151                         job->set_progress (float(i.get()) / _film->length().get());
 152                 }
 153
 154                 _butler->get_audio (interleaved, audio_frames);
 155                 /* XXX: inefficient; butler interleaves and we deinterleave again */
 156                 float* p = interleaved;
 157                 for (int j = 0; j < audio_frames; ++j) {
 158                         for (int k = 0; k < _output_audio_channels; ++k) {
 159                                 deinterleaved->data(k)[j] = *p++;
 160                         }
 161                 }
 162                 (*encoder)->audio (deinterleaved);
 163         }
 164         delete[] interleaved;
 165
 166         BOOST_FOREACH (shared_ptr<FFmpegFileEncoder> i, _file_encoders) {
 167                 i->flush ();
 168         }
 169 }
 170
 171 float
 172 FFmpegEncoder::current_rate () const
 173 {
 174         return _history.rate ();
 175 }
 176
 177 Frame
 178 FFmpegEncoder::frames_done () const
 179 {
 180         boost::mutex::scoped_lock lm (_mutex);
 181         return _last_time.frames_round (_film->video_frame_rate ());
 182 }